An improved, general procedure to S-aryl thiol esters: A new synthetic application of dry arenediazonium o-benzenedisulfonimides

Synthesis

Volumn , Issue 8, 2003, Pages 1225-1230

  Barbero, Margherita ^a   Degani, Iacopo ^a   Dughera, Stefano ^a   Fochi, Rita ^a  

^a UNIVERSITY OF TURIN   (Italy)

Author keywords

Diazonium compounds; Sulfur; Thiol esters

Indexed keywords

AVERAGE YIELDS;

ACETONITRILE; REACTION KINETICS; SYNTHESIS (CHEMICAL);

ESTERS;

ACETIC ACID DERIVATIVE; ACETONITRILE; BENZENE DERIVATIVE; BENZOIC ACID DERIVATIVE; DIAZONIUM COMPOUND; IMIDE; POLYCYCLIC AROMATIC HYDROCARBON DERIVATIVE; SULFONE DERIVATIVE; THIOESTER; THIOL DERIVATIVE;

ARTICLE; PURIFICATION; REACTION ANALYSIS; REACTION TIME; ROOM TEMPERATURE; SYNTHESIS; TEMPERATURE DEPENDENCE;

EID: 0038049475     PISSN: 00397881     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (51)

1. For example, see: (a) Wood, H. C. S. In Comprehensive Organic Chemistry, Vol. 5; Pergamon Press: Oxford, 1979, Chap. 24.3, 516-521. (b) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 849-850; and references cited therein.
2. For example, see: (a) Wood, H. C. S. In Comprehensive Organic Chemistry, Vol. 5; Pergamon Press: Oxford, 1979, Chap. 24.3, 516-521. (b) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 849-850; and references cited therein.
3. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
4. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
5. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
6. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
7. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
8. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
9. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
10. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
11. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
12. For a general survey, see: (a) Field. L. Synthesis 1972, 101. (b) Wardell, G. L. In The Chemistry of Functional Group: The Chemistry of Thiol Group, Part 1; Patai, S., Ed.; Wiley: New York, 1974, Chap. 4, 206-209. (c) Haslam, E. Tetrahedron 1980, 36, 2409. (d) Bauer, W.; Kuhlein, K. In Houben-Weyl; Methoden der organischen Chemie 4th ed., Vol. 5E, Falbe, J., Ed.; Thieme: Stuttgart, 1985, 850-890. (e) Spessard, G. O.; Chan, W. K.; Masamune, S. Org. Synth., Coll. Vol. VII; Wiley: New York, 1990, 81-87. (f) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 415-424. (g) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 451. (h) Ogliaruso, M. A.; Wolfe, J. F. In Updates from The Chemistry of Functional Groups: Synthesis of Carboxylic Acids, Esters and Their Derivatives; Patai, S.; Rappaport, Z., Eds.; Wiley: New York, 1991, 454-455. (i) Voss, J. In Comprehensive Organic Synthesis, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: New York, 1991, Chap. 2.5, 437-457. (j) Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 3rd ed.; Wiley: New York, 1999, 431-433.
13. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
14. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
15. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
16. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
17. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
18. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
19. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
20. Some recent examples for the reactions of thiol esters: (a) Fukuyama, T.; Lin, S.-C.; Li, L. J. Am. Chem. Soc. 1990, 112, 7050. (b) Liu, H.-J.; Rose, P. A.; Sasaki, D. J. Can. J. Chem. 1991, 69, 934. (c) Adam, W.; Hadjiarapoglou, L. Tetrahedron Lett. 1992, 33, 469. (d) Penn, J. H.; Owens, W. H. Tetrahedron Lett. 1992, 33, 3737. (e) Hsung, R. P.; Babcock, J. R.; Chidsey, C. E. D.; Sita, L. R. Tetrahedron Lett. 1995, 36, 4525. (f) Tokuyama, H.; Yokoshima, S.; Yamashita, T.; Fukuyama, T. Tetrahedron Lett. 1998, 39, 3189. (g) Kurosu, M. Tetrahedron Lett. 2000, 41, 591. (h) Shimizu, T.; Seki, M. Tetrahedron Lett. 2002, 43, 1039.
21. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
22. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
23. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
24. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
25. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
26. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
27. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
28. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
29. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
30. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
31. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
32. Some recent examples for the preparation of thiol esters: (a) Sucheta, K.; Reddy, G. S. R.; Ravi, D.; Rao, N. R. Tetrahedron Lett. 1994, 35, 4415; and references cited therein. (b) Jia, X.; Zhang, Y.; Zhou, X. Tetrahedron Lett. 1994, 35, 8833. (c) Ravi, D.; Rao, N. R.; Reddy, G. S. R.; Sucheta, K.; Rao, V. J. Synlett 1994, 856. (d) Jia, X.; Zhang, Y.; Zhou, X. Synth. Commun. 1994, 24, 387. (e) Adamczyk, M. A.; Fishpaugh, J. R. Tetrahedron Lett. 1996, 37, 4305; and references cited therein. (f) Degani, I.; Dughera, S.; Fochi, R.; Gazzetto, S. J. Org. Chem. 1997, 62, 7228. (g) Meshram, H. M.; Reddy, G. S.; Bindu, H.; Yadav, J. S. Synlett 1998, 877; and references cited therein. (h) Chen, R.; Zhang, Y. Synth. Commun. 1999, 29, 3699. (i) Wang, L.; Chen, Z.-C. J. Chem. Res., Synop. 2000, 3722. (j) Movassagh, B.; Lakouraj, M. M.; Fadaei, Z. J. Chem. Res., Synop. 2001, 22. (k) Clericuzio, M.; Degani, I.; Dughera, S.; Fochi, R. Synthesis 2002, 921. (l) Lakouraj, M. M., Movassagh, B.; Fadaei, Z. Monatsh. Chem. 2002, 133, 1085.
33. (a) Petrillo, G.; Novi, M.; Garbarino, G.; Filiberti, M. Tetrahedron Lett. 1988, 29, 4185.
34. (b) Petrillo, G.; Novi, M.; Garbarino, G.; Filiberti, M. Tetrahedron 1989, 45, 7411.
35. (c) Cevasco, G.; Novi, M.; Petrillo, G.; Thea, S. Gazz. Chim. Ital. 1990, 120, 131.
36. You, J.-Z.; Chen, Z.-C. Synthesis 1992, 521.
37. Barbero, M.; Degani, I.; Diulgheroff, N.; Dughera, S.; Fochi, R. Synthesis 2001, 585; and references cited therein.
38. Barbero, M.; Degani, I.; Diulgheroff, N.; Dughera, S.; Fochi, R. Synthesis 2001, 585; and references cited therein.
39. (a) Barbero, M.; Crisma, M.; Degani, I.; Fochi, R.; Perracino, P. Synthesis 1998, 1171.
40. (b) Barbero, M.; Degani, I.; Dughera, S.; Fochi, R.; Perracino, P. Synthesis 1999, 90.
41. (c) Barbero, M.; Degani, I.; Diulgheroff, N.; Dughera, S.; Fochi, R.; Migliaccio, M. J. Org. Chem. 2000, 5600.
42. Wassmundt, F. W.; Kiesman, W. F. J. Org. Chem. 1995, 60, 1713.
43. Dictionary of Organic Compounds on CD-ROM, Version 10.1; Chapman & Hall Electronic Publishing Division: London, 2002.
44. Perumal, S.; Vasuki, G.; Vijayabaskar, V.; Selvaraj, S.; Boykin, D. W. Magn. Reson. Chem. 1998, 36, 720.
45. Oh, H. K.; Shin, C. H.; Lee, I. J. Chem. Soc., Perkin Trans. 2 1995, 1167.
46. Morgenstern, J.; Kunz, D.; Mayer, R. Pharmazie 1969, 24, 450.
47. Douglas, K. T.; Yaggi, N. F.; Mervis, C. M. J. Chem. Soc., Perkin Trans. 2 1981, 171.
48. Raoult, A.; Vilkas, M. J. Bull. Soc. Chim, Fr. 1968, 8, 3315.
49. Cilento, G. J. Am. Chem. Soc. 1953, 75, 3748.
50. Adam, W.; Kumar, A. S.; Saha-Möller, C. R. Tetrahedron Lett. 1995, 36, 7853.
51. Baliah, V.; Ganapathy, K. J. Indian Chem. Soc. 1963, 40, 1.